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115 ILCS 5/4

(115 ILCS 5/4)(from Ch. 48, par. 1704)(Text of Section WITH the changes made by P.A. 98-599, which has been held unconstitutional)Sec. 4. Employer rights. Employers shall not be required to bargain over matters of inherent
managerial policy, which shall include such areas of discretion or policy
as the functions of the employer, standards of services, its overall
budget, the organizational structure and selection of new employees and
direction of employees. Employers, however, shall be required to bargain
collectively with regard to policy matters directly affecting wages, hours
and terms and conditions of employment as well as the impact thereon upon
request by employee representatives, except as provided in Section 10.5. To preserve the rights of employers
and exclusive representatives which have established collective bargaining
relationships or negotiated collective bargaining agreements prior to the
effective date of this Act, employers shall be required to bargain
collectively with regard to any matter concerning wages, hours or
conditions of employment about which they have bargained for and agreed to
in a collective bargaining agreement prior to the effective date of this Act, except as provided in Section 10.5.(Source: P.A. 98-599, eff. 6-1-14.)

(Text of Section WITHOUT the changes made by P.A. 98-599, which has been held unconstitutional)Sec. 4. Employer rights. Employers shall not be required to bargain over matters of inherent
managerial policy, which shall include such areas of discretion or policy
as the functions of the employer, standards of services, its overall
budget, the organizational structure and selection of new employees and
direction of employees. Employers, however, shall be required to bargain
collectively with regard to policy matters directly affecting wages, hours
and terms and conditions of employment as well as the impact thereon upon
request by employee representatives. To preserve the rights of employers
and exclusive representatives which have established collective bargaining
relationships or negotiated collective bargaining agreements prior to the
effective date of this Act, employers shall be required to bargain
collectively with regard to any matter concerning wages, hours or
conditions of employment about which they have bargained for and agreed to
in a collective bargaining agreement prior to the effective date of this Act.(Source: P.A. 83-1014.)